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Old 07-25-2019, 07:11 AM
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Chevy1925 Chevy1925 is offline
don't know sh!t about IFS

 
Join Date: Oct 2009
Location: Phoenix Az
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Quote:
Originally Posted by Bdsankey View Post
After looking at the rpm/speed calculator I can see why. 3rd gear is only 2.1:1 ratio whereas 4th is 1.31:1. Every auto duramax guy until up until 800-1000hp runs 3rd gear in an Allison which is 1.41:1 so he should be able to run it in 4th.
but you are not accounting for converter torque coupling that basically reduces 4th gear ratio by 2 or 3:1 UNTIL you hit lock up. that helps get you out of the gate with enough speed before hitting lock up and carrying it through.

you slip a clutch like this and it wont last long
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2002 LB7, LLY, LBZ, LMM, LML, L5P 2500HD CC/LB dmax/6sp alli "The Limo"

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